The Timeline feature, which was unveiled at this year’s F8 Developer’s Conference in September, offers users a virtual history similar to a digital scrapbook. Timeline maps out each user’s profile as a series of events arranged chronologically.

The Timeline, the company’s biggest interface change, is the result of a six-month development work, where developers did not only create new software, but they also worked a way to quickly roll out the service to 800 million users.

“Timeline gives you an easy way to rediscover the things you shared, and collect your most important moments,” said Facebook in a blog post, announcing the launch of the new service to its 800 million members. “It also lets you share new experiences, like the music you listen to or the miles you run.”

To get the new feature, users must go to the Facebook Timeline page and click on the “Get It Now” button. This serves as an alternative way if users don’t get the announcement on top of the profile page.

Facebook is giving users seven days to edit their profiles before they roll out the Timeline permanently. So, if you’ve uploaded embarrassing photos or posts on the social network, you still have time to delete them.

The Facebook Timeline has gotten mixed reactions from its users, where some people like the change, while others prefer the simpler interface of the old profile page.